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Yes, that is the problem. Like most companies, they do not want to give away any of their secrets, so the technical data is vague and the MSDS only has to list dangerous chemicals. With the concentrate version being less than 50% phosphoric acid, there is another 50% of unlisted ingredients that are not hazardous, but not likely to be all water.

This is true. But what could be the other ingredients besides water? Wouldn't the acid destroy most other addictives?

I believe I only payed $60.00 for a gallon at West Marine. That was plenty to do 1 motor. I believe if you strain the used BB it can be re-used for the other motor. I have seen this but have not personally tried it.